To upgrade your plan please see this new article: https://support.joistapp.com/en/articles/10063038-how-do-i-upgrade-my-joist-plan
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To cancel or downgrade your subscription please see this new article: https://support.joistapp.com/en/articles/10063345-how-do-i-cancel-or-downgrade-my-plan
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To change your payment method please see this new article:: https://support.joistapp.com/en/articles/10063314-how-do-i-change-my-plan-payment-method